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Agent for improving viscosity index and lubricant composition

A technology for viscosity index improvement and lubricating oil composition, which is applied in the direction of lubricating composition, additives, petroleum industry, etc., can solve the problems of unstable effect, insufficient improvement effect of viscosity index, insufficient shear stability of copolymer, etc. Achieve excellent effects of shear stability and viscosity index improvement ability

Active Publication Date: 2007-01-10
SANYO CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the conventional polymethacrylate-based viscosity index improvers are not only insufficient in the viscosity index improving effect, but also have insufficient shear stability of the copolymer, and have a problem that the effect is not stable over a long period of time.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1 to 16、 and comparative manufacture example 1 to 4

[0232] In a reaction vessel equipped with a stirring device, a heating and cooling device, a thermometer, a dropping funnel, and a nitrogen injection pipe, add 25 parts of mineral oil as a diluting solvent [high viscosity index oil with a burning point of 164°C (abbreviated as MO-1) Or naphthenic mineral oil (abbreviated as MO-2) with a burning point of 122°C], add a total of 100 parts of the monomers disclosed in Table 6-1 to 3, and the amount disclosed in Table 6 as Dodecylmercaptan (abbreviated as DM) as a chain transfer agent, and 2,2'-azobis(2,4-dimethylvaleronitrile) as a radical polymerization initiator in the amount disclosed in Table 6 (abbreviated as ADVN) or 2,2'-azobis(2-methylbutyronitrile) (abbreviated as AMBN), stirred and mixed at 20°C to prepare a monomer solution, which was added to the dropping funnel. After replacing the gas phase of the reaction vessel with nitrogen, the monomer solution was dripped for 4 hours under airtight conditions at 85°C, and after ...

Embodiment 1 to 13、 comparative example 1 to 2

[0254] ATF was manufactured by adding so that the total of the following components may be 100%.

[0255] 〔Adding ingredients〕

[0256] Type and amount of each copolymer solution disclosed in Table 7; 9.7 to 19.7%

[0257] Oleamide salt of dilauryl phosphate [organophosphorus compound equivalent to (P)]; 1%

[0258] Polybutene succinic acid imide ("Hitec E638" manufactured by Ethyl Cooper Company) [equivalent to the dispersant of (D)]; 3%

[0259] Overbased sulfonic acid Ca ("Hitec E611" manufactured by Ethyl Cooper Company) [equivalent to (E) clarifying agent]; 1%

[0260] Zinc dialkyldithiophosphate ("Amoco 194" manufactured by Amoco Corporation) [equivalent to friction and wear modifier of (I)]; 0.3%

[0261] 2,6-di-tert-butyl-p-cresol ("Lubrizol 817" manufactured by Lubrizol Corporation) [antioxidant equivalent to (F)]; 0.2%

[0262] High viscosity index oil (kinematic viscosity at 100°C: 3mm 2 / s, viscosity index: 115, ignition point: 200°C); the remainder

[0263] ...

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Abstract

This viscosity index improver comprises a copolymer (A) that has a monomer (a) represented by general formula (1) as an essential structural monomer and a Z average molecular weight of 10,000-1,000,000. The general formula (1) is represented by CH2=C(R1)-COO(A-O)n-(CH2)p-CH(R2)-R3(1) wherein, R1is a hydrogen atom or a methyl group, R2and R3are each a 1-16C straight chain alkyl group or a 3-34C branched alkyl group, R2and R3may be identical or different, a number of continuous methylene groups in the branched alkyl group is <=16, the total of carbon numbers of R2, R3and p CH2groups is 18-36, A is a 2-4C alkylene group, n is an integer of 0 or 1-20, and p is an integer of 0 or 1-15.

Description

technical field [0001] The present invention relates to a viscosity index improver (viscosity index improver) and its lubricating oil composition. Background technique [0002] In recent years, the situation of global environmental protection has increased, and people have further demanded energy-saving properties of automobiles. As one energy-saving means, reduction of viscous resistance by reducing the viscosity of lubricating oil is mentioned. However, if the viscosity is simply lowered, there will be problems of leakage and burning. In order to solve this problem, it is generally necessary to increase the viscosity index. Various viscosity index improvers have been proposed previously, and in particular, several viscosity index improvers including polymethacrylate (polymethacrylate) copolymers have been proposed (for example, Japanese Patent No. (Kaihei No. 7-48421, Japanese Patent Laid-Open No. 7-70247, Japanese Patent Laid-Open No. 7-509023) [0003] However, the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M145/14C10M137/02C10N30/02
CPCC10N2220/028C10N2020/071C10M145/14C10M157/04C10M157/08C10N2030/02
Inventor 由岐刚
Owner SANYO CHEM IND LTD